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Plasma arc fusion covering repair method for continuous casting rollers

A plasma arc and repair method technology, which is applied in the field of ion arc cladding repair, can solve the problems that the long life and high quality of the continuous casting roll cannot be fully satisfied, the service life of the continuous casting roll is affected, and the deformation of the continuous casting roll base material is large. , to achieve the effects of high production efficiency, high controllability, and improved performance and life.

Inactive Publication Date: 2013-02-06
QINHUANGDAO GERUIDE ENERGY SAVING TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, continuous casting rolls are mainly repaired by surfacing technology, such as submerged arc surfacing, open arc surfacing, strip surfacing, etc. It is easy to have defects such as slag inclusions, pores, and cracks in the repaired continuous casting rolls, which seriously affects the service life of the repaired continuous casting rolls
At the same time, the welding process leads to problems such as large deformation of the continuous casting roll base material, which also affects the yield of the continuous casting roll repair
Overlay welding technology has been unable to fully meet the long-life and high-quality requirements of iron and steel enterprises for repaired continuous casting rolls, and there is an urgent need for a continuous casting roll repair method with low energy consumption, low cost, environmental protection, and strong process controllability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, the continuous casting roll whose material is 35CrMo and whose size is φ230mm×618mm is repaired is taken as an example. First, a preliminary inspection is carried out on the continuous casting roll whose material is 35CrMo to be repaired; , carry out magnetic particle flaw detection and ultrasonic flaw detection to ensure that there are no serious cracks on the surface of the continuous casting roll and the base material. The WC alloy powder is put into a mechanical powder mixer and fully mixed. After the mixing time is 1.5 hours, the mixed alloy powder of Ni45 and WC is obtained. The mixing ratio of the mixed alloy powder is: Ni45 alloy powder accounts for 96% of the total mass, and WC The alloy powder accounts for 4% of the total mass. Mix the mixed alloy powder and latex glue at a weight ratio of 17:1, and stir evenly. The stirred alloy powder has a certain viscosity and no agglomeration, and then paint the mixed alloy powder evenly On the surface...

Embodiment 2

[0021] Taking the continuous casting roll repaired with material of 42CrMo and size of φ230mm×618mm as an example, a preliminary inspection is performed on the continuous casting roll whose material is 42CrMo to be repaired; Flaw detection and ultrasonic flaw detection to ensure that there are no serious defects such as cracks on the surface of the continuous casting roll and the base material, and the outer diameter of the continuous casting roll is processed to φ224mm; the mechanical mixing method is used to select 80-mesh Ni45 alloy powder and 120-mesh WC alloy powder in proportion Put it into a mechanical powder mixer and mix it well. The mixing time is 2 hours to obtain Ni45 and WC mixed alloy powder. The mixing ratio of the mixed alloy powder is: Ni45 alloy powder accounts for 97% of the total mass, and WC alloy powder accounts for the total mass. 3% of the mixed alloy powder and milky white rubber in a weight ratio of 16:1, and stir evenly. The mixed alloy powder after s...

Embodiment 3

[0023] Taking the continuous casting roll repaired with material of 42CrMo and size of φ150mm×600mm as an example, a preliminary inspection is carried out on the continuous casting roll whose material is 42CrMo to be repaired; then the fatigue layer on the surface of the continuous casting roll is removed by turning for 2mm, and the magnetic particle Flaw detection and ultrasonic flaw detection to ensure that there are no serious defects such as cracks on the surface of the continuous casting roll and the base material, and the outer diameter of the continuous casting roll is processed to φ146mm; the mechanical mixing method is used to select 120-mesh Ni45 alloy powder and 300-mesh WC alloy powder in proportion Put it into a mechanical powder mixer and mix it well. The mixing time is 2 hours to obtain Ni45 and WC mixed alloy powder. The mixing ratio of the mixed alloy powder is: Ni45 alloy powder accounts for 98% of the total mass, and WC alloy powder accounts for the total mass...

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Abstract

The invention discloses a plasma arc fusion covering repair method for continuous casting rollers. The plasma arc fusion covering repair method includes steps of preliminarily examining a continuous casting roller; removing a fatigue layer of the surface of the continuous casting roller; performing magnetic particle inspection and ultrasonic inspection; preparing mixed alloy powder of Ni45 and WC (wolfram carbide) according to a proportion by a mechanical powder mixer; mixing and stirring the mixed alloy powder and white emulsion according to a proportion; coating the mixed alloy powder on the surface of a base material of the continuous casting roller, scanning the pre-coated alloy powder by a single plasma arc channel via plasma arc fusion covering equipment to form an alloy layer; and finely finishing the continuous casting roller by a lathe or a grinder to obtain a continuous casting roller meeting technical requirements. Compared with the prior art, the plasma arc fusion covering repair method has the advantages of capabilities of obviously prolonging the service life of the continuous casting roller and reducing alloy consumption, high heat resistance and controllability, simplicity in process, low cost and energy consumption, and the like.

Description

technical field [0001] The invention relates to a method for repairing mechanical parts, in particular to a method for repairing continuous casting rolls by plasma arc cladding. Background technique [0002] Continuous casting rolls are one of the important components of the slab continuous casting system in modern steelmaking plants, and are used in every working section of the continuous casting production line. The early damage of the continuous casting roller during work seriously affects the continuous production of the continuous casting machine. At the same time, the wear and damage of the roller also reduces the quality of the slab product and increases the production cost. The material of the continuous casting roll is mainly 35CrMo or 42CrMo steel, which is made by precision casting, forging billet, quenching and tempering heat treatment and finishing. During work, on the one hand, the continuous casting rolls have to bear the cyclic load caused by the bulging for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06B23P6/00C23C24/10
Inventor 赵明鹰
Owner QINHUANGDAO GERUIDE ENERGY SAVING TECH SERVICE
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